“Using one partner’s genes for height, we estimated the height of the chosen partner with 13% accuracy.

The similarity in height between partners is driven by the observed physical appearance of the partner, specifically their height, rather than influenced by the social or genetic structure of the population we live in.”

This is another study that supports the idea that most people are looking for someone similar to themselves, even similar DNA:

“Now you can add similar DNA to similar religion, race, income, education, body type and age, to the attributes which people look for in a partner, whether they know it or not.

New research shows that people are more likely to pick a mate with similar DNA, even after taking into account genetic similarities between people in a geographic location

[…]

Previous studies have shown that one of the strongest factors in choosing a partner is educational level.

This study found that the effect of similar DNA was about one-third that of education on mating choices.”